bro who tf looks at elites in halo and is like you know what we need on the internet. Like at least mass effect made it so that you can smash them but for reals.
It's canon for Sangheili to have breasts actually, guest. The only female showed in the Halo canon, Han 'Chavamee in Halo Legends, had breasts. No fucking idea why they do but they do, I just saw some of the movie yesterday
Iirc those are actually the males of that species of grouse, and they smack those balls together to attract females
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Edit: https://youtu.be/cLnbiTkj1TQ
Can skip to around 1:18
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Edit: https://youtu.be/cLnbiTkj1TQ
Can skip to around 1:18